Our app has two ways to add tabs to your products: Standard and Static tabs. Standard tabs are created based on your Product Description text. In other words, the app just splits your Product Description into separate tabs. So you can add all the content directly to Shopify's native Edit Product page. You should use that option if you'd like a unique set of tabs for each product. Here's a video explaining how Standard tabs work:
Another option is Static tabs. These tabs are added in our app admin panel (Shopify Admin -> Apps -> Product Description Tabs -> Static Tabs) and you may create a tab once and it will be added to all your Products (or wide range of them). This way is useful for some content that is the same for all the products, like Shipping terms, Reviews tab and so on. Here's short video explaining how Static tabs work: